Fusible cut-out.



PATENTED DEC. 12, 1905.

G. BAEHR. FUSIBLE GUT-OUT.

APPLICATION FILED JAN.14, 1904.

M VMB\ s t st 7 mu 0 m WITNESSES.

INVENTOR.

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GEORGE BAEHR, OF MOKEESPORT, PENNSYLVANIA, ASSIGNOR TO NATIONAL TUBE COMPANY, OF PITTSBURG, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

FUSIBLE OUT-OUT.

Specification of Letters Patent.

Patented Dec. 12, 1905.

Application filed January 14, 1904. Serial No. 189,016.

To aZZ whom, it may concern:

Be it known that I, GEORGE BAEHR, a resident of McKeesport, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Fusible Out-Outs; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to fusible cut-outs of the kind ordinarily used for incandescent electric lighting and known as rosette or ceiling blocks.

The object of my invention is to provide a simple device of this character which is so constructed that the are which is formed when the fuse blows will be instantly interrupted, thus preventing damage to the fuse-block and parts to which the same is attached.

In ordinary ceiling-blocks or rosettes, such as used for incandescent electric lighting and similar purposes, one of the difficulties is that the passage-ways between the terminals which are connected by the fuses are so straight that with fairly high tension currents, such as are now commercially used, an arc will be formed and maintained between the terminals when a fuse blows, this are being of such high amperage that it melts the fuse-block and otherwise does damage.

The object of my invention is to overcome this difliculty in rosettes, and tothis end the invention consists, generally stated, in so arranging the terminals and more especially the passage-ways between the terminals that the latter shall be circuitous or tortuous, thus preventing the formation of an are when a fuse blows, or at least quickly quenching the same.

In the accompanying drawings, Figure 1 is a plan view of the cover portion of my fuseblock. Fig. 2 is a plan view of the base portion. Fig. 3 is a section on the line 3 3, Fig. 1; and Fig. 1 is a section on the line 4: 41, Fig. 1, showing the parts assembled.

The base portion of my fuse-block, and the one which is ordinarily adapted for securing to the ceiling, wall, or other place, comprises a body 1, of insulating material, having a substantially flat face and being provided, preferably, on opposite sides with recesses 2 and 3, in which are secured the terminal clamps or binding-posts 4 and 5, respectively, and having attached thereto the hook-like terminals 6 and 7. The base is raised, as at 8, to cause the cover to snap into place and prevent said cover from working loose.

The cover portion of the fuse-block comprises a body 10, which has on its upper face the hook-like terminals 11 and 12, which cooperate or interlock with the hook-terminals 6 and 7 of the base to hold the two parts to gether in the well-known manner, the arrangement in my block being such that the connection is made by sliding the cover in a straight line with reference to the base, instead of rotating it, as has heretofore been the custom. It will be obvious, however, that by a slight rearrangement of these parts they can be made to interlock by a rotary movement, as is customary.

The cover 10 is provided centrally with an opening 13, through which lead the wires or cords, as is common. The ends of these wires are connected to binding-screws 1 1 and 15, secured to short metal bases 16 and 17. Interposed between these two metal pieces is a comparatively deep rib or projection 18, thus preventing a short circuit between said metal pieces.

The cover is preferably formed practically square, as shown, although this is not absolutely necessary, and the terminals 11 and 12 are arranged in opposite sides thereof, while the terminals 16 and 17 are on one of the remaining sides. Also projecting upwardly from the body of the cover is a substantially V-shaped rib having the branches 19 thereof extending out toward the corners of the block and having the apex of the V surrounding the hole through the block, while another rib 20 projects out toward one side and connects with the rim 21, formed on the outer edge of the cover. On each side of the branches of the V-shaped rib are triangular projections 22, which are so located as to leave a narrow passage between the same and the branches of the V and leading down into close proximity to the terminals 11 and 12.

The fuses 2 1 connect the terminals 11 and 16 and 12 and 17, respectively, and-lie in the grooves or passages formed by the projecting ribs 19, rim 21, and triangular projections 22 ofthe cover. These grooves or passage-Ways, it will be observed, do not lead in a direct line, but are very circuitous or tortuous, the limbs 19 of the V-shaped rib extending across the direct path between the terminals and sufficiently far beyond the same to prevent the formation or maintenance of any are, it being well known that if a solid non-conductor be projected across the path of an are it will defleet the latter, and if projected sufficiently far the arc must finally rupture. This is the principle followed in my fuse block, the branches 19 of the V-shaped rib acting to defleet and rupture the arcs.

It has been found by actual trial that a fuseblock constructed as shown in the drawings is very efficient, practically no are being formed.

Various modifications in the details of construction may be made without departing from the spirit of my invention.

What I claim is- 1. A rosette cut-out comprising two insulating members which together form a chamber, one of said members being provided with a central opening, two terminals mounted on said member, one terminal being adjacent to the central opening, a fuse connecting said terminals, an insulating-partition formed by a rib integral with one of said members and terminating in proximity to the walls of said chamber and dividing the latter into two parts, said fuse extending around the end of said partition, and means for securing the two members together.

2. A rosette cut-out comprising two insulating members which together form a chamber, one of said members being provided with a central opening, two terminals mounted on said member, one terminal being adjacent to the central opening, a fuse connecting said terminals, an insulating-partition formed by a rib integral with one of said members and terminating in proximity to the walls of said chamber and dividing the latter into two parts, said fuse extending around the end of said partition, and cooperating interlocking hooked terminals on said members.

3. A rosette cut-out comprising insulating members which together form two chambers, two pairs of terminals mounted on one of said members, one pair in each chamber, a fuse connecting the terminals of each pair, insulating-partitions formed by ribs integral with one of said members and terminating in proximity to the walls of the chambers and dividing the latter into two parts, said fuses extending around the ends of said partitions, and means for securing the two members together.

4- A rosette cut-out comprising two insulating members which together form two chambers, one of said members being provided with a central opening, two pairs of terminals mounted on said member, one pair in each chamber, one terminal of each pair being adjacent to the central opening, a fuse connecting the terminals of each pair, insulating partitions formed by ribs integral with one of said members and terminating in proximity to the walls of said chambers and dividing the latter into two parts, said fuses extending around the ends of said partitions, and means for securing the two members together.

5. A rosette cut-out comprising two insulating members which together form two chambers, two pairs of terminals mounted on one of said members, one pair in each chamber, one terminal of each pair being formed as a hook, a fuse connecting the terminals of each pair, insulatingpartitions formed by ribs integral with one of said members and terminating in proximity to the walls of the chambers and dividing the latter into two parts, said fuses extending around the end of said partitions, and hooked terminals on the other of said members which interlock with the hooked terminals of the first-named member.

6. A cut-out comprising an insulating-body,

a V-shaped rib projecting from the face of said body, a second rib lying between the branches of said V-shaped rib, terminals on either side of the last-named rib and inside of the branches of the V-shaped rib, cooperating terminals outside of the V-shaped rib and near the apex thereof, and fuses connecting the terminals inside of the V-shaped rib with those outside of the V-shaped rib and extend ing through passages at the ends of the branches of the V-shaped rib.

7. Acut-outcomprisinganinsulating-body, a V-shaped rib projecting from the face thereof, a second rib lying between the branches of said V-shaped rib, terminals on either side of said last-named rib and inside the branches of the V-shaped rib, other terminals provided with hook-shaped contacts lying outside of the branches of the V-shaped rib and near the apex thereof, fuses connecting said terminals in pairs and extending through passages at the ends of the branches of the V-shaped rib, and a cooperating base of insulating material provided with hook-shaped contacts arranged to interlock with the hook-shaped contacts of the first-named body.

In testimony whereof I, the said GEORGE BAEHR, have hereunto set my hand.

GEO. BAEHR.

Witnesses:

J. A. CAUGHEY, E. P. COREY. 

